I believe it's due to indecision. We may want to do something, but put it off till its the right time, if it ever is. Others can be lazy and just put it off indefinately. Depends on the person.

There are many answers, including the nice one above. Depression can influence the desire or lack of desire to complete a task. But, on the other hand, among the typical population, everyone has a different sense of urgency. They may not think they procrastinate. They do things according to the inner calendar and sense of necessity and timing.

I am a master procrastinater. I procrastinate when there are things I really don't want to do which can range from brushing my teeth to completing my midterm paper. There's really no reason for me other than I am lazy.

I'll explain it later.

Here from dictionary.com is the definition of procrastinate: verb (used without object) 1. to defer action; delay: to procrastinate until an opportunity is lost. –verb (used with object) 2. to put off till another day or time; defer; delay. or from americn Heritage dictionary: v. intr. To put off doing something, especially out of habitual carelessness or laziness. v. tr. To postpone or delay needlessly. I find that the definition is too harsh and that there are more underlying issues for example procrastination may also be an indicator of a more serious physical or psychological problem that would respond positively to treatment. Often, such procrastination is not observed by the one procrastinating, but by others close to that person. Extreme anxiety, severe clinical depression, obsessive compulsive disorder, attention deficit disorder with or without hyperactivity, and illnesses that are related to memory loss are examples of such dysfunctions that may lead to procrastination. A poor distinction between urgency and priority. In the beginning of the urgency-priority cycle, procrastinators tend to attend to "comfort" tasks which are most convenient, interesting, or within reach. Priority is sacrificed for convenience. As these tasks are being attended to, however, other tasks begin to pile up, and soon a backlog of tasks cry out for attention. A jumble of new and old tasks become marked as urgent, and the procrastinator is forced to drop current tasks to attend to the urgent ones. In a sense, what is urgent has become priority. This confusion continues as tasks split into three categories which cry out for attention and which are increasingly difficult to distinguish, namely, priority/urgent; priority/non- urgent; non-priority/urgent. Meanwhile, the attractiveness of the non-urgent, non-priority comfort tasks still lure the procrastinator to do them. The result is that the procrastinator becomes subject to the tyranny of the urgent, is unable to establish proper priorities, and constantly seeks reprieve from these stresses by attending to tasks that are neither urgent nor priority! I find myself doing the second part more and more. I make my resolutions at the beginning of the year and organize them so as to get them done with the best time management possible. But as things come up that are "dificult" to deal with for number of reason, I end up doing nothing or half ass everything.

Choices.